[PULL 11/46] ninjatool: use constant names for stamp files

[Paolo Bonzini <pbonzini@redhat.com>]

Numbering files according to rules causes confusion, because
CUSTOM_COMMAND3.stamp from a previous build might represent
completely different targets after Makefile.ninja is regenerated.
As a result, the new targets are not rebuilt and compilation
fails.

Use the targets to build a SHA1 hash; the chances for collision
are one in 2^24 even with a 12-character prefix of the hash.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 scripts/ninjatool.py | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/scripts/ninjatool.py b/scripts/ninjatool.py
index ba6bd9a2a6..627a1cab45 100755
--- a/scripts/ninjatool.py
+++ b/scripts/ninjatool.py
@@ -34,6 +34,7 @@ import os
 import re
 import json
 import argparse
+import hashlib
 import shutil
 
 
@@ -51,6 +52,9 @@ else:
     normpath = os.path.normpath
 
 
+def sha1_text(text):
+    return hashlib.sha1(text.encode()).hexdigest()
+
 # ---- lexer and parser ----
 
 PATH_RE = r"[^$\s:|]+|\$[$ :]|\$[a-zA-Z0-9_-]+|\$\{[a-zA-Z0-9_.-]+\}"
@@ -767,7 +771,6 @@ class Ninja2Make(NinjaParserEventsWithVars):
         self.build_vars = defaultdict(lambda: dict())
         self.rule_targets = defaultdict(lambda: list())
         self.stamp_targets = defaultdict(lambda: list())
-        self.num_stamp = defaultdict(lambda: 0)
         self.all_outs = set()
         self.all_ins = set()
         self.all_phony = set()
@@ -903,8 +906,7 @@ class Ninja2Make(NinjaParserEventsWithVars):
             if len(out) == 1:
                 stamp = out[0] + '.stamp'
             else:
-                stamp = '%s%d.stamp' %(rule, self.num_stamp[rule])
-                self.num_stamp[rule] += 1
+                stamp = '%s@%s.stamp' % (rule, sha1_text(targets)[0:11])
             self.print('%s: %s; @:' % (targets, stamp))
             self.print('%s: %s | %s; ${ninja-command-restat}' % (stamp, inputs, orderonly))
             self.rule_targets[rule].append(stamp)
-- 
2.26.2